电动汽车无线充电系统耦合线圈的优化设计

为了提高电动汽车无线充电系统磁耦合机构的耦合系数，在分析耦合线圈参数对串联补偿网络影响的基础上，采用电磁仿真分析法，对单圆形磁耦合线圈传输距离、内外经尺寸、绕线方式对自感系数、耦合系数的影响进行了研究。结果表明：磁耦合线圈自感系数的稳定性受其外径和传输距离之比影响，磁耦合线圈外径与传输距离之比越小，磁耦合线圈自感系数越稳定；当传输距离和磁耦合线圈外径确定时，磁耦合线圈内外径之比越小，耦合线圈的耦合系数越高；当两个磁耦合线圈传输距离、外径尺寸、互感系数相同时，不同绕线方式的线圈，其耦合系数也不相同，其中匝间距等增绕线方式的线圈可以获得较高的耦合系数。

Optimal Design of Coupling Coil for Wireless Charging System of Electric Vehicle

In order to improve the coupling coefficient of magnetic coupling mechanism of electric vehicle wireless charging system,based on the analysis of the influence of coupling coil parameters on series compensation network,the effects of transmission distance,internal and external warp size and winding mode of single circular magnetic coupling coil on self inductance coefficient and coupling coefficient are studied by using electromagnetic simulation analysis method. The results show that the stability of the self inductance coefficient of the magnetic coupling coil is affected by the ratio of its outer diameter to transmission distance. The smaller the ratio of the outer diameter of the magnetic coupling coil to the transmission distance,the more stable the self inductance coefficient of the magnetic coupling coil. When the transmission distance and the outer diameter of the magnetic coupling coil are determined,the smaller the ratio of the inner diameter to the outer diameter of the magnetic coupling coil,the higher the coupling coefficient of the coupling coil. When the transmission distance,outer diameter and mutual inductance of the two magnetic coupling coils are the same,the coupling coefficients of the coils with different winding methods are also different. The coils with increased winding methods such as turn spacing can obtain higher coupling coefficients.